Bump actions/upload-artifact from 2 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v2...v4)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/build-custom.yml

@@ -220,7 +220,7 @@ jobs:
           wait $PIDfluid
         fi
     - name: Archive logs
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         name: logs
         path: |
@@ -234,7 +234,7 @@ jobs:
           tutorials/partitioned-pipe/fluid1-openfoam-pimplefoam/fluid1-openfoam-pimplefoam.log
           tutorials/partitioned-pipe/fluid2-openfoam-pimplefoam/fluid2-openfoam-pimplefoam.log
     - name: Archive case files
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         name: case-files
         path: |